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/qemu/docs/
H A Dmulti-thread-compression.txt1 Use multiple thread (de)compression in live migration
32 thread compression can be used to accelerate the compression process.
40 compression ratio. High compression ratio will take more time, level 0
41 stands for no compression, level 1 stands for the best compression
76 | | compression level: 1
96 | | compression level: 1
112 to support the multiple thread compression migration:
116 2. Activate compression on the source:
119 3. Set the compression thread count on source:
122 4. Set the compression level on the source:
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H A Dxbzrle.txt25 The compression format performs a XOR between the previous and current content
/qemu/ui/
H A Dvnc-enc-zlib.c79 err = deflateInit2(zstream, vs->tight->compression, Z_DEFLATED, in vnc_zlib_stop()
88 vs->zlib.level = vs->tight->compression; in vnc_zlib_stop()
92 if (vs->tight->compression != vs->zlib.level) { in vnc_zlib_stop()
93 if (deflateParams(zstream, vs->tight->compression, in vnc_zlib_stop()
97 vs->zlib.level = vs->tight->compression; in vnc_zlib_stop()
H A Dvnc-enc-tight.c299 int compression = vs->tight->compression; in tight_detect_smooth_image() local
317 if (w * h < tight_conf[compression].gradient_min_rect_size) { in tight_detect_smooth_image()
338 return (errors < tight_conf[compression].gradient_threshold); in tight_detect_smooth_image()
967 int level = tight_conf[vs->tight->compression].mono_zlib_level; in send_mono_rect()
1044 int level = tight_conf[vs->tight->compression].gradient_zlib_level; in send_gradient_rect()
1081 int level = tight_conf[vs->tight->compression].idx_zlib_level; in send_palette_rect()
1299 int level = tight_png_conf[vs->tight->compression].png_zlib_level; in send_png_rect()
1300 int filters = tight_png_conf[vs->tight->compression].png_filters; in send_png_rect()
1544 max_size = tight_conf[vs->tight->compression].max_rect_size; in send_rect_simple()
1545 max_width = tight_conf[vs->tight->compression].max_rect_width; in send_rect_simple()
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H A Dspice-core.c666 spice_image_compression_t compression; in qemu_spice_init() local
775 compression = SPICE_IMAGE_COMPRESS_AUTO_GLZ; in qemu_spice_init()
778 compression = parse_compression(str); in qemu_spice_init()
780 spice_server_set_image_compression(spice_server, compression); in qemu_spice_init()
H A Dvnc.h194 uint8_t compression; member
/qemu/tests/qemu-iotests/
H A D28764 _qcow2_dump_header --no-filter-compression | grep incompatible_features
70 _qcow2_dump_header --no-filter-compression | grep incompatible_features
78 _qcow2_dump_header --no-filter-compression | grep incompatible_features
90 _qcow2_dump_header --no-filter-compression | grep incompatible_features
H A D242.out15 compression type: COMPRESSION_TYPE
37 compression type: COMPRESSION_TYPE
71 compression type: COMPRESSION_TYPE
113 compression type: COMPRESSION_TYPE
164 compression type: COMPRESSION_TYPE
H A D287.out3 === Testing compression type incompatible bit setting for zlib ===
8 === Testing compression type incompatible bit setting for zstd ===
23 === Testing compression type values ===
H A D082.out20 compression type: COMPRESSION_TYPE
34 compression type: COMPRESSION_TYPE
55 compression_type=<str> - Compression method used for image cluster compression
81 compression_type=<str> - Compression method used for image cluster compression
107 compression_type=<str> - Compression method used for image cluster compression
133 compression_type=<str> - Compression method used for image cluster compression
332 compression type: COMPRESSION_TYPE
345 compression type: COMPRESSION_TYPE
642 compression type: COMPRESSION_TYPE
655 compression type: COMPRESSION_TYPE
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H A D198.out39 compression type: COMPRESSION_TYPE
85 compression type: COMPRESSION_TYPE
H A D206.out21 compression type: COMPRESSION_TYPE
45 compression type: COMPRESSION_TYPE
69 compression type: COMPRESSION_TYPE
95 compression type: COMPRESSION_TYPE
112 compression type: COMPRESSION_TYPE
H A D274.out50 compression type: COMPRESSION_TYPE
76 compression type: COMPRESSION_TYPE
108 compression type: COMPRESSION_TYPE
132 compression type: COMPRESSION_TYPE
164 compression type: COMPRESSION_TYPE
H A D302.out20 compression type: COMPRESSION_TYPE
H A D314.out8 === Testing rebase with compression onto no backing file ===
24 === Testing rebase with compression with raw backing file ===
H A D061.out554 compression type: COMPRESSION_TYPE
581 compression type: COMPRESSION_TYPE
596 compression type: COMPRESSION_TYPE
612 compression type: COMPRESSION_TYPE
626 compression type: COMPRESSION_TYPE
641 compression type: COMPRESSION_TYPE
/qemu/qapi/
H A Ddump.json19 # zlib compression
22 # compression
25 # snappy compression
28 # compression (since 8.2)
31 # compression (since 8.2)
34 # compression (since 8.2)
H A Dmigration.json551 # @none: no compression.
553 # @zlib: use zlib compression method.
770 # @multifd-compression: Which compression method to use. Defaults to
775 # where 0 means no compression, 1 means the best compression
781 # where 0 means no compression, 1 means the best compression
940 # @multifd-compression: Which compression method to use. Defaults to
945 # where 0 means no compression, 1 means the best compression
951 # where 0 means no compression, 1 means the best compression
1139 # @multifd-compression: Which compression method to use. Defaults to
1144 # where 0 means no compression, 1 means the best compression
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/qemu/
H A Dmeson_options.txt196 description: 'lzo compression support')
214 description: 'snappy compression support')
246 description: 'JPEG lossy compression for VNC server')
261 description: 'zstd compression support')
H A Dqemu.nsi41 ; Use maximum compression.
H A Dhmp-commands.hx1079 "-z: dump in kdump-compressed format, with zlib compression.\n\t\t\t"
1080 "-l: dump in kdump-compressed format, with lzo compression.\n\t\t\t"
1081 "-s: dump in kdump-compressed format, with snappy compression.\n\t\t\t"
1101 dump in kdump-compressed format, with zlib compression.
1103 dump in kdump-compressed format, with lzo compression.
1105 dump in kdump-compressed format, with snappy compression.
/qemu/docs/system/arm/
H A Dnuvoton.rst77 * Encoding compression engine
/qemu/docs/interop/
H A Dqcow2.txt119 a non-default compression is used for compressed
212 Defines the compression method used for compressed clusters.
213 All compressed clusters in an image use the same compression
218 compression type). Otherwise, this field must not be present
221 Available compression type values:
225 The deflate compression type is called "zlib"
227 deflate compression type do not have zlib headers.
H A Ddbus.rst13 - background tasks (compression, streaming etc)
/qemu/docs/tools/
H A Dqemu-img.rst112 For qcow2, the compression algorithm can be specified with the ``-o
429 Only the formats ``qcow`` and ``qcow2`` support compression. The
430 compression is read-only. It means that if a compressed sector is
785 on Windows), optional AES encryption, zlib or zstd based compression and
804 This option configures which compression algorithm will be used for
808 with the ``compress`` filter driver or backup block jobs with compression
812 ``compat=0.10``, only ``zlib`` compression is available.

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